For this you need to create a query that will find you the names of patients who have got their recall set to 3, or 6 monthly monthly.
To create the query:
When this query is run it will return a list of adult or child patients whose dental recall is set to the number of months you have entered.
To find the patients with postponed appointments month by month create the following query
When this query is run it will ask for a date for both the beginning and end of your timeframe.